The Astro Pneumatic 3006 4-Inch Air Angle Grinder with Lever Throttle is designed for grinding, deburring and smoothing metal surfaces. It accepts grinding discs, stones, brushes and metal abrasive cups designed for a 3/8-inch 24 spindle. Range of uses includes welding shops, body shops industrial and fabrication shops. Specifications: Pad Size: 4-inch, Free Speed: 11,000rpm, Overall Length: 9.25-inch (235mm), Net Weight: 4-pound (1.81kg), Spindle Thread Size: 3/8-inch - 24, Air Inlet Thread NPT: 1/4-inch, Air Hose I.D. Size: 3/8-inch (10mm), Avg. Air Consumption: 10cfm, Air Pressure: 90-120psi.